BCA Construction Quality Assessment System

R4 – 1 Oct 2021

CONQUAS® 2019

BCA Construction Quality Assessment System

CONQUAS® 2019

R4 – 1 Oct 2021

2

CONQUAS® 2019

CONQUAS®

THE BCA

CONSTRUCTION QUALITY ASSESSMENT SYSTEM

Copyright @ 2019 by the Building and Construction Authority, Singapore. All rights reserved. No part may be reproduced, in any form or by any means, without permission in writing from the publisher.

While every effort has been made to ensure the accuracy of the information presented in this publication, neither the Authority nor its employees or agents can accept responsibility for any loss or damage incurred in connection with the use of the contents.

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CONQUAS® 2019

CONTENTS

1.0 INTRODUCTION....................................................................................................4

1.1 Objectives of CONQUAS

1.2 Scope of CONQUAS

1.3 Derivation of CONQUAS

1.4 CONQUAS Assessor

2.0 CONQUAS.............................................................................................................8

2.1 Components to be assessed

2.2 The Weightages

2.3 Sampling

3.0 THE ASSESSMENT................................................................................................11

3.1 Assessment Approach

3.2 Assessment

3.3 Bonus Points

3.4 Major Defects

3.5 Score Moderation Framework

3.6 Computation of CONQUAS Score

3.7 Publication of CONQUAS Scores

APPENDICES

Appendix 1 Quality Standards for Internal Finishes Works........................................... 31

Appendix 2 Quality Standards for External Works........................................................ 42

Appendix 3 Quality Standards for Materials and Functional Tests............................... 50

Appendix 4 Defects Grouping Guide for Assessment of Internal Finishes.................... 52

Appendix 5 Building Grouping Guide………………………………………………………………………… 53

Revision Log ………………………………………………………………………………………………………………. 54

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CONQUAS® 2019

1.0 INTRODUCTION

Construction Quality Assessment System (CONQUAS) 2019 is now the tenth edition of the CONQUAS assessment scheme after 30 years of implementation.

The key changes are as follows:

(a) A streamlined framework with 3 main building categories (b) Greater emphasis on architectural quality and water seepage issues (c) Introduction of factory checks for projects using prefabricated prefinished

volumetric construction (PPVC) methods, which recognizes and encourages good practices that are both productive and facilitate high quality achievements

1.1 Objectives of CONQUAS

The Building and Construction Authority (BCA) developed the Construction Quality

Assessment System (CONQUAS) in conjunction with major public sector agencies and

various leading industry professional bodies, organizations and firms to measure the

quality level achieved in a completed project.

CONQUAS was designed with three objectives:

(a) To have a standard quality assessment system for construction projects. (b) To make quality assessment objective by:

‐ measuring constructed works against workmanship standards and specification.

‐ using a sampling approach to suitably represent the whole project.

(c) To enable quality assessment to be carried out systematically within

reasonable cost and time.

CONQUAS is an independent assessment. Unless specified in the building contract,

project engineers or architects should not use CONQUAS to decide if the building or

parts of the building project are acceptable.

1.2 Scope of CONQUAS

CONQUAS sets out the standards for the various aspects of construction work and

awards points for works that meet the standards. These points are then summed up

to give a total quality score called the CONQUAS Score for the building project.

CONQUAS covers most aspects of general building architectural works and

assessments shall be completed prior to application for TOP or CSC inspection,

whichever comes first.

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CONQUAS® 2019

The assessment consists of four components: (1) Internal Finishes, (2) Installation Methods Verification and Functional Tests, (3) External Finishes, and (4) Bonus Points

Each component is further divided into different items for assessment. However, the assessment excludes works such as piling, heavy foundation and sub‐structure works which are heavily equipment‐based, buried or covered and usually called under separate contracts or sub‐contracts. Design, choice of materials and end users’ aesthetic preferences are also excluded from the assessment.

The building is assessed primarily on workmanship standards achieved through factory and site inspection. For projects using Design for Manufacturing and Assembly (DfMA) technologies, assessments will be done throughout the construction process with the Installation Methods Verification and some of the Functional Tests carried out in the factory.

The assessment on the functional performance of selected services and installations help to safeguard the interest of building occupants in relation to safety, comfort and aesthetic defects which surface only after some time.

To ensure the robustness of the CONQUAS score, major defects (e.g. water seepages through wall/window, inter‐floor leakages, functionally deficient doors/windows etc.) detected during the internal finish assessments will be taken into consideration. The scoring will factor in the severity of these major defects. Adverse feedback from end‐users on major defects that surface during the defects liability period of a project will also be considered when finalising the CONQUAS score.

In addition, the 3‐tier CONQUAS Scheme (see Table A) is introduced to help developers/contractors further raise the quality of their new private residential developments. This involves a higher sampling rate assessment where more samples will be covered and more areas for improvement identified. The 3‐tier CONQUAS Scheme will apply to all CONQUAS applications for new *private residential developments.

The 3‐tier CONQUAS Scheme is applicable where: (a) developers or main contractors, in the past 3 years,

i. with no CONQUAS track record for *private residential development, or ii. has at least one *private residential development with CONQUAS score

below the threshold CONQUAS score4 or iii. has at least one *private residential development with major defects

affecting ≥ 20 units or 5% of all units, whichever is lower (Upon the expiry of the 3 year period, BCA retains the discretion to impose Tier 3 CONQUAS assessment if BCA assesses that the major defects have not been reasonably addressed.)

(b) all other developers or main contractors i. to be decided after the initial CONQUAS score3 is generated

*Note: Includes private mixed developments with residential component.

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CONQUAS® 2019

Table A – 3‐Tier CONQUAS Scheme

S/N Applicants Tier 1 Tier 2a Tier 2b Tier 3

25% sampling

(25% of the

units will be

checked, and

sampling will

be conducted

within units)

50% sampling1

(50% of the

units will be

checked, and

sampling will

be conducted

within units)

100% sampling (all units will be checked, and sampling will be conducted within units)

100% checks2

(all locations within all units will be checked)

a) Developers or main contractors i. with no CONQUAS track

record for *private residential development in the past 3 years, or

‐ During

CONQUAS

application

When the initial CONQUAS score 3 is below the threshold CONQUAS score4 set by BCA

‐

ii. has at least one *private residential development in the past 3 years with CONQUAS Score below the threshold CONQUAS score4, or

‐ ‐

iii. has at least one *private residential development in the past 3 years with major defects5 affecting ≥ 20 units or 5% of all units, whichever is lower

Upon the expiry of the 3‐year period,

BCA retains the discretion to impose

Tier 3 CONQUAS assessment if BCA

assesses that the major defects5 have

not been reasonably addressed.

‐ ‐ ‐ During

CONQUAS

application

*Note: Includes private mixed developments with residential component.

1 Additional samples will be taken on: architectural internal finishes samples, wet areas water tightness tests for toilets/bathrooms, window water tightness tests.

2 100% checks refer to the same regime of inspection as QM. Projects will be required to meet a higher score set at the bottom 40th percentile of industry average CONQUAS score of all private residential developments completed in the preceding year.

3 The initial CONQUAS score will be derived after 20% (for tier 2a) and 50% (for tier 2b) of the required architectural internal finishes samples are completed.

4 The threshold CONQUAS score is set at the bottom 10th percentile of industry average CONQUAS score for private residential projects in the preceding year.

5 Major defects refer to defects that would generally not be acceptable to end‐users as specified in the guide on “Construction Quality Assessment System (CONQUAS)” available on BCA’s website.

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CONQUAS® 2019

1.3 Derivation of CONQUAS

The minimum standards were derived from discussions with the major public sector

agencies, developers, consultants and contractors based on the general

specifications used in their projects.

To match the expectations from the end users, feedback through complaints,

homeowners’ survey findings and defects listings were also considered in refining the

weightages and assessment standards.

In developing CONQUAS, studies and numerous trials were conducted to fine‐tune its new test techniques and assessment standards. Moderation of the scoring system was carried out along with trials to ensure accuracy, consistency and alignment with end users expectations.

1.4 CONQUAS Assessor

BCA assessors undergo a rigorous training programme. They are required to attend

BCA's in‐house CONQUAS training and calibration programme to ensure competency

and consistency in the assessment.

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CONQUAS® 2019

8 We shape a safe, high quality, sustainable and friendly built environment

2.0 CONQUAS

2.1 Components to be assessed

The CONQUAS assessment is divided into four main components –

(a) Internal Finishes, (b) Installation Methods Verification and Functional Tests, (c) External Finishes, and (d) Bonus Points.

(a) Internal Finishes

Internal finishes deal mainly with the finishes and components. This is the part where the quality and standard of workmanship are most visible. The assessment covers:

(i) architectural finishes, which includes floors, internal walls, ceiling, doors, windows and components. Components include permanent internal fixtures (such as wardrobe, kitchen cabinet, vanity top, mirror, bathtub, water closet, shower screen, basin etc.), and permanent external fixtures (such signage, railings, unit number plates, lift fittings, letter box, lightings, metal gate, etc.).

(ii) basic M&E fittings, which includes taps and mixers, WC, floor traps, electrical switches, trunkings, fan coil unit, air‐con diffuser, light fittings, CCTV camera, shower head, etc. At the lift lobby, lift display and call‐button panels are checked as M&E basic fittings.

The quality standards for Internal Finishes are given in Appendix 1

(b) Installation Methods Verification and Functional Tests

(i) Installation methods verification on the following 4 trades will be carried out during the initial construction stage of the project:

a) Waterproofing works to bathrooms/toilets b) Stone/tiling installation works c) Timber flooring installation d) Window installation

The entire process for the above‐mentioned trades will be verified by

BCA against the submitted approved method statements and

compared against BCA’s good industry practice guides.

For projects that adopt prefabricated prefinished volumetric

construction (PPVC), the verification of the above installation methods

will be carried out in the factory.

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CONQUAS® 2019


a), b), c) and d) will be waived if the PPVC manufacturer/factory is

Manufacturer Accreditation Scheme (MAS) accredited and a) will be

waived if the waterproofing specialist is SCI accredited

(ii) Functional tests check on window water‐tightness, wet area water‐tightness and adhesion of internal wall tiles will be carried out. For projects that adopt PPVC, a maximum of 30% of the total window water‐tightness test samples and 20% of the total wet area water tightness test samples will be carried out in the factory.

(c) External Finishes

(i) The assessment will cover the roofs, external walls and external works at the completion stage of the building.

(d) Bonus Points

(i) Certified QM/CONQUAS Personnel CONQUAS bonus point is awarded for projects that employ certified

QM/CONQUAS personnel. This is to facilitate quality achievement and

encourage deployment of competent certified personnel on site.

(ii) Design/Material Choices Bonus points are given to projects using better buildable designs which

facilitate higher quality achievement.

(iii) Quality Mark (QM) Projects Bonus points are given to the project according to the quality rating

achieved under the QM tiered rating scheme.

.

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CONQUAS® 2019


2.2 The Weightages

In CONQUAS, the weightages for Internal Finishes, Installation Methods Verification

and Functional Tests, External Finishes, and Bonus Points are allocated according to

three categories of buildings as follows:

Components to be

Assessed

Category of Development

Weightage (%)

Private Residential

Public

Residential

Non‐

Residential

1. Internal Finishes 60 55 50

2. Installation Methods Verification and Functional Tests

20 25 30

3. External Finishes 20 20 20

Sub Total

CONQUAS Score 100 100 100

4. Bonus Points 8 7 7

Total

CONQUAS Score 108 107 107

Note : (i) For private mixed development with residential component, the project will follow

the weightage under the private residential category.

The total CONQUAS score of a building is the sum of points awarded to the four

components in each category of building.

2.3 Sampling

As it is impractical to assess all elements in a building, CONQUAS uses a sampling system for the assessment. The sampling system, which is based on the gross floor area of the building, will ensure that the assessment adequately represents the entire building.

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CONQUAS® 2019


3.0 THE ASSESSMENT

3.1 Assessment Approach

In general, the Assessor should select the actual locations to be assessed prior to each assessment. Selection of samples shall be based on drawings and location plans. The samples shall be distributed as uniformly as possible throughout the construction stages.

The scoring will be done on the works that are inspected for the first time. Rectification and correction carried out after the assessment will not be re‐scored. The objective of this practice is to encourage contractors "doing things right the first time".

When an assessed item does not comply with the corresponding CONQUAS standards, it is considered failed and an "X" will be noted in the assessment form. Likewise a "" is given for an item meeting the standards. A "blank" will indicate that the item is not applicable. The score is computed based on the number of "" over the total number of items assessed.

3.2 Assessment

Assessment is typically carried out upon completion of the building and before

handing over of the project to the owner. Only the verification of the installation

methods and functional tests would be carried out during the initial stage and

progressive stages of the construction progress.

The assessment consists of the following items:

Assessment Items

Category of Development

Weightage (%)

Private

Residential

Public

Residential

Non‐

Residential

Internal Finishes 60 55 50

Floor 16.3 14.5 13.5

Internal Wall 10.2 9.3 13.6

Ceiling 10.1 9.4 5.1

Door 7.2 6.8 5.1

Window 7.2 6.7 5.1

Component 6 5.5 5.1

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M&E basic Fittings 3 2.8 2.5

Installation Methods Verification and

Functional Tests 20 25 30

Field Window Water‐Tightness Test (WTT)

(BCA Test) 9 11.5 14

*Field Window Water‐Tightness Test

(WTT) (Self‐Testing) *Pre‐requisite *Pre‐requisite *Pre‐requisite

Wet Area Water‐Tightness Test (BCA Test) 5 6.5 8

*Wet Area Water‐Tightness Test (Self‐Testing) *Pre‐requisite *Pre‐requisite *Pre‐requisite

Pull‐Off‐Test for Internal Wall Tiles 4 5 6

#Installation Method Verification 2 2 2

External Finishes 20 20 20

Roof 5 5 5

External Wall 5 5 7.5

External Works 10 10 7.5

Sub Total CONQUAS Score 100 100 100

Bonus Points 8 7 7

Total CONQUAS Score 108 107 107

Note: # These checks may be covered under QM assessment and PPVC projects under the MAS

certification audits. These checks may be waived by BCA, if the PPVC system is already certified

under MAS. Assessment for internal wet area waterproofing works will be waived and points

allocated if the appointed contractor for such works is accredited under the Singapore

Concrete Institute (SCI) Accreditation Scheme for Waterproofing Specialist Contractors. The

accredited waterproofing contractor must produce a valid SCI certificate that covers the entire

contractual period of the installation works for the project.

Score will be prorated accordingly if any of the 4 trades are not applicable to the project.

* Project Qualified Person to declare the results of the self‐testing carried out by the project.

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CONQUAS® 2019


Weightages for internal finishes and M&E fittings assessment of Private Residential

projects are allocated at the defect level based on the guidelines set out below:

Element Element Weightage Defect Category Defect Weightage

Floor

16.3 points

Finishing 4.9

Alignment & Evenness 2.9

Crack & Damages 4.9

Hollowness 2

Jointing 1.6

Internal Wall

10.2 points

Finishing 2.6


Crack & Damages 4.6

Hollowness 1

Jointing 0.8

Ceiling

10.1 points

Finishing 2

Alignment & Evenness 2

Crack & Damages 3.1

Roughness 2.5

Jointing 0.5

Door 7.2 points

Joint & Gap 0.7


Material & Damages 1.8

Functionality 2.2

Accessories Defects 1.8

Window 7.2 points

Joint & Gap 0.7



Functionality 2.9


Component 6 points

Joint & Gap 0.6



Functionality 0.9


M&E Fitting 3 points

Joint & Gap 0.3



Functionality 1.2


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CONQUAS® 2019


Weightages for internal finishes and M&E fittings assessment of Public Residential



Floor

14.5 points

Finishing 4.4


Crack & Damages 4.4

Hollowness 1.8

Jointing 1.4

Internal Wall

9.3 points

Finishing 2.4


Crack & Damages 4.2

Hollowness 0.9

Jointing 0.7

Ceiling

9.4 points

Finishing 1.9


Crack & Damages 2.8

Roughness 2.3

Jointing 0.5

Door 6.8 points

Joint & Gap 0.7



Functionality 2


Window 6.7 points

Joint & Gap 0.7



Functionality 2.6

Accessories Defects 1

Component 5.5 points

Joint & Gap 0.6



Functionality 0.8


M&E Fitting 2.8 points

Joint & Gap 0.3



Functionality 1.1


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CONQUAS® 2019


Weightages for internal finishes and M&E fittings assessment of Non Residential



Floor

13.5 points

Finishing 4


Crack & Damages 4

Hollowness 1.7

Jointing 1.4

Internal Wall

13.6 points

Finishing 3.4


Crack & Damages 6.1

Hollowness 1.4

Jointing 1.1

Ceiling

5.1 points

Finishing 1


Crack & Damages 1.5

Roughness 1.3

Jointing 0.3

Door 5.1 points

Joint & Gap 0.5



Functionality 1.5


Window 5.1 points

Joint & Gap 0.5



Functionality 2


Component 5.1 points

Joint & Gap 0.5


Material & Damages 2

Functionality 0.8


M&E Fitting 2.5 points

Joint & Gap 0.25



Functionality 1


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CONQUAS® 2019


The assessment is based on the sampling guidelines table as set out below:

Sampling Guidelines Table

Items GFA per Sample

MinSampl

e

MaxSampl

e Remarks

1 Internal Finishes 500 m2 50 150 For Non‐Residential Project & Public Mixed Development Project with Non‐Residential GFA exceeding 50%

1a Internal Finishes 70 m2 90 800

For all Private Residential Project & Mixed Development Project with Residential component. For Public Mixed Development Project with Residential GFA exceeding 50%

1a(i) Internal Finishes (Tier 2a)

‐ 90 1,440

50% Sampling (50% coverage for all units): Max Principal samples: 640 Max Service samples: 640 Max Circulation samples: 160

1a(ii) Internal Finishes (Tier 2b)

‐ 90 2,160

100% Sampling (100% coverage for all units): Max Principal samples: 1000 Max Service samples: 1000 Max Circulation samples: 160

1b Internal Finishes 70 m2 90 600 For Public Residential Project

2 External Wall ‐ 100% ‐ 100% of the blocks or units

3 External Work ‐ 1 ‐ 1 for each type of external work

4 Roof ‐ 50% ‐ Minimum 50% of the blocks or units

5a Field Window Water‐tightness Test (WTT)

‐ 20 100

Conducted by BCA. A sample is defined as 2m length of joint. 5% of total number of window panels or 5% of total curtain wall area, whichever is applicable

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CONQUAS® 2019


5b(i) Field Window Water‐tightness Test (WTT) (Tier 2a)

‐ 40 200

50% Sampling 10% of total number of window panels or 10% of total curtain wall area, whichever is applicable For all Private Residential Project & Mixed Development Project with Residential component

5b(ii) Field Window Water‐tightness Test (WTT) (Tier 2b & Tier 3)

‐ 40 200

100% Sampling 20% of total number of window panels or 20% of total curtain wall area, whichever is applicable For all Private Residential Project & Mixed Development Project with Residential component

5c Field Window Water‐tightness Self‐Test (WTT)

‐ 25% ‐ Self‐Testing with declaration by project Qualified Person

6a

Wet Area Water‐tightness Test:

Non‐Residential Projects

Residential Projects

‐ ‐

20

60

100

300

Conducted by BCA: Non‐Residential Projects: • 20% of all bathrooms and/or toilets (by location) Residential projects: • 30% of all bathrooms and/or toilets (by location) • all will be tested if less than the minimum sample (for all projects)

7b(i) Wet Area Water‐tightness Test (Tier 2a)

‐ 100 600

50% Sampling (50% of all bathrooms and/or toilets): Based on number of bathrooms and/or toilets For all Private Residential Project & Mixed Development Project with Residential component All will be tested if less than the minimum sample

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CONQUAS® 2019


7b(ii) Wet Area Water‐tightness Test (Tier 2b)

‐ 120 1000

100% Sampling (100% coverage for all units): Based on number of bathrooms and/or toilets For all Private Residential Project & Mixed Development Project with Residential component All will be tested if less than the minimum sample

7c Wet Area Water‐tightness Self‐Test

100% • Self‐Testing with declaration by project Qualified Person • Including flat roof

8

Installation methods of following trades, (i) Waterproofing works (ii) Marble/tiling works (iii) Timber flooring works, and (iv) Window Installation works

‐ ‐ ‐ Assessment based on approved Method Statement, where applicable

9 Pull‐Off‐Test for Internal Wall tiles

10,000 m2

1 set

5 sets

5 tiles per set (by location)

A location for internal finishes assessment is a functional space of a building such

as a room, hall, toilet, kitchen, yard, corridor or lobby. Locations are further

categorized into three types:

Principal locations are major functional places such as halls and rooms.

Circulation locations include lift lobbies, corridors and staircases.

Service locations are utility areas such as toilets, kitchens, balconies and

yards.

The computed number of locations will be distributed according to "Principal",

"Circulation" and "Service" based on the percentages set out in the two categories of

buildings as below:

Locations

Building Categories

Residential* Non‐

Residential

Principal 40% 60%

Service 40% 15%

Circulation 20% 25%

*Note: For private residential under the 3‐Tier CONQUAS scheme, please refer to the above sampling guidelines table.

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Scoring of internal finishes is based on the defects groups as shown in Appendix 4 'Defects Grouping Guide for Assessment of Internal Finishes'.

In general, any item which is not available in a project will not be considered for scoring. For such case, the architectural score will be pro‐rated accordingly. However, any available item that is not offered for assessment will be considered as failed and no points awarded.

An item under assessment will be considered failed if it does not meet the standards. In addition, any item found to be defective functionally such as evidence of water seepage in the window, wall, slab, ceiling or roof, is considered to have failed the assessment. Likewise, for a particular defect that is found excessive in an item (say excessive cracks on a wall).

For the assessment of roof, a minimum 50% of the total number of buildings will be assessed. For the assessment of external walls, 100% of the total number of buildings will be assessed. For a building, the external wall will be divided into 4 walls for assessment.

The External Works assessment consists of the following locations:

(a) Link‐way / Shelter ‐ 10m length section per sample and minimum 2 samples

(b) Apron & Drain ‐ 10m length section per sample and minimum 2 samples

(c) Roadwork & Carpark ‐ 10m length section per sample and minimum 1 sample

(d) Footpaths & Turfing ‐ 10m length section per sample and minimum 2 samples

(e) Playground ‐ 1 location

(f) Court ‐ 1 location

(g) Fencing & Gate ‐ 10m length section per sample and minimum 1 sample

(h) Swimming Pool ‐ 10m length section per sample and minimum 1 sample

(i) Club House ‐ 1 location

(j) Guard House ‐ 1 location

(k) Electrical Substation ‐ 1 location

Each item in the External Works will be assessed separately and all the locations listed above must be assessed where applicable.

Under the material & functional tests, self‐test items like field window water‐tightness

test for 25% of windows and 100% wet area water‐tightness test (including flat roof)

are set as pre‐requisites and based on declaration by the project Qualified Person (QP).

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3.3 Bonus Points

(a) Design/Material Choices Bonus points are given to projects using better buildable designs which facilitate

higher quality achievement.

Requirement Bonus Point

Use of advance precast concrete system (*APCS) elements supplied

by SCI Accredited Precasters

0.5

Use of prefabricated MEP plant modules 0.5

Use of Prefabricated Bathroom Unit (PBU)

at least 65% of toilets)

{The PBU system has to be accredited under the PBU Manufacturer

Accreditation Scheme (MAS)}

1.0

Use of Prefabricated Prefinished Volumetric Construction (PPVC) (at

least 65% of coverage)

{The PPVC system has to be accredited under the PPVC Manufacturer


2.0

Use of Mass Engineered Timber (e.g. Cross Laminated Timber, Glued

Laminated Timber, etc.) (at least 65% of coverage)

{A building is deemed constructed using engineered timber if both

the floor (including roof) and wall are constructed using engineered

timber.}

1.0

Use of productive materials, which facilitate higher quality

achievement(at least 65% of coverage) – 0.3 points each e.g.

i. Engineered wood/ Stone flooring ii. Vinyl flooring iii. Other productive material

Max. 1.0

* APCS refers to a precast construction method that applies the 3S principles of Standardisation, Simplicity and Single Integrated elements. For areas to be considered as APCS, (i) slabs shall be of precast; and (ii) adopt at least 4 out of 6 features, with coverage of at least 65%. (refer to https://bca.gov.sg/buildableDesign/advanced‐precast‐concrete‐system.html ).

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CONQUAS® 2019


(b) Certified QM/CONQUAS Personnel

CONQUAS bonus point is awarded for projects that employ certified QM/CONQUAS

personnel. This is to facilitate quality achievement and encourage deployment of

competent certified personnel on site.


Certified CONQUAS Supervisor 0.15

Certified QM Supervisor 0.3 A supervisor can only be deployed on one project at any time

Supervisor must be deployed fulltime during the project duration

Certified CONQUAS Manager 0.4

Certified QM Manager 0.6 A manager can be deployed for maximum of 2 projects at any

time Maximum 1.0

Note:

1. QM/CONQUAS Personnel must be certified and deployed minimally for the period

between commencement of the superstructure works and completion of the

project.

2. Both employer and employee must declare the personnel was deployed for the

minimum duration as specified.

3. The QM/CONQUAS manager/supervisor shall demonstrate commitment and

satisfactory performance during the project duration pertaining to quality and

CONQUAS assessment issues. It is the responsibility of the certified personnel to

ensure the project personnel attend all allocated CONQUAS training, assessments

are completed, and submission of documents done timely. They should conduct

themselves in a professional manner when dealing with feedback on defects

related to workmanship quality, failing which, CONQUAS bonus points will not be

awarded.

4. Where required, additional documents and records shall be furnished for

verification.

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CONQUAS® 2019


(c) Quality Mark (QM) Projects

Bonus points are given to the project according to the quality rating achieved under

the QM tiered rating scheme.

Requirement Bonus Point*

QM STAR 1.0

QM EXCELLENT 0.5

3.4 Major Defects

Major defects are largely classified as defects that would generally not be acceptable

to end‐users. Examples are as follows:

a) Any missing/ broken accessories for the architectural items assessed b) Any cracked/ chipped/ broken window panes, shower screens, mirrors and any

glass items; c) Any visually visible cracked tiles/ stones, timber doors & flooring, ceiling boards

and cracks on painted walls, etc.; d) Functionally deficient doors, windows, wardrobes and cabinets, tap, water closet,

switches, etc.; e) Fan coil unit leaking, water seepage through walls or windows, etc.; f) Misaligned door frame – only for cases where verticality tolerance > 3mm per door

frame height.

When a major defect is identified during the assessment by BCA, it is considered failed

and two "X" instead of one will be noted in the assessment form.

Declaration by the project QP shall be required on the satisfactory rectification of these

major defects before the issue of the CONQUAS score.

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3.5 Score Moderation Framework

(a) Adverse Feedback

This is to allow for fine‐tuning of score for any valid negative feedback, received during

a project‘s defect liability period e.g. major workmanship issues that are surfaced or

reported questionable / unacceptable practices, etc.

A Review Committee will evaluate and approve points to be deducted for such cases:

Major Defects/ Issues Reported CONQUAS Point Deduction

1. Major Defects a) Water seepage through walls and/ windows;

b) Water seepage in the bathrooms/ toilets.

Up to 4 points

2. Questionable/ Unacceptable practices, e.g. cardboards found under timber flooring

Up to 5 points

3. Major defects/ Questionable/ Unacceptable practices with significant social impact, e.g. cement bags/ newspaper found in door frames, national iconic projects with leakages in roof/ façade, etc.

Up to 10 points

(b) Restricted Samples Given for Assessment

To ensure that the sampling system adequately represent the quality of the whole

project, CONQUAS score will be adjusted based on the areas provided for assessment,

as follows:

Average *Areas Offered for Assessment CONQUAS Point Deduction

90 ~ 95% 2 points

75 ~ 90% 4 points

50 ~ 75% 6 points

Less than 50% 10 points

Note: *Based on number of units for residential projects and blocks/floors for other projects

A project may not be issued the CONQUAS score if less than 90% of the required

internal finish samples were assessed.

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3.6 Computation of CONQUAS Score

Below are two examples of how a project’s CONQUAS score will be computed:

Scenario 1:

Project Type ‐ Commercial (Non‐Residential)

Structural System ‐ 70% coverage for APCS

Roofing System ‐ Flat Roof

Nos of Toilet ‐ 10 nos (100% Prefabricated Bathrooms

accredited under the PPVC MAS and supplied by

an Accredited Precaster)

Fulltime Certified Personnel ‐ 2 CONQUAS supervisors, 1 CONQUAS Manager

Step 1: Main Assessment Score

Assessment Items Weightage

(%) Score Remarks

Internal Finishes 50 41.1

Floor 13.5 10.8

Internal Wall 13.6 10.5

Ceiling 5.1 4.4

Door 5.1 4.5

Window 5.1 4.6

Component 5.1 4.3

M&E basic Fittings 2.5 2

Installation Methods

Verification and

Functional Tests

30 29

Field Window Water‐

Tightness Test (WTT)

(BCA Test)

14 14

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CONQUAS® 2019


*Field Window

Water‐Tightness Test

(WTT) (Self‐Testing)

Pre‐requisite submitted

Wet Area Water‐

Tightness Test

(BCA Test)

8 8

*Wet Area Water‐

Tightness Test

(Self‐Testing)

Pre‐requisite submitted

Pull‐Off‐Test for

Internal Wall Tiles 6 5

Installation Method

Verification 2 2

No tiling, no timber

flooring, prorated for

waterproofing, and

windows installation

methods.

External Finishes 20 13

Roof 5 3

External Wall 7.5 5

External Works 7.5 5

Sub Total

CONQUAS Score 100 83.1

Step 2: Computation of Bonus Points

Requirement Bonus Point ScoreUse of advance precast concrete system

(APCS) elements supplied by SCI

Accredited Precasters

0.5

0.5

Use of prefabricated MEP plant modules 0.5 0

Use of Prefabricated Bathroom Unit (at

least 65% of toilets)

1.0

1.0

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CONQUAS® 2019


Use of Prefabricated Prefinished

Volumetric Construction (PPVC) (at least

65% of coverage)

{The PPVC system has to be accredited

under the PPVC Manufacturer


2.0

0

Use of Mass Engineered Timber (e.g.

Cross Laminated Timber, Glued

Laminated Timber, etc.) (at least 65% of

coverage)

{A building is deemed to be constructed

using engineered timber if both the floor

(including roof) and wall are constructed

using engineered timber.}

1.0

0

Use of productive materials, which

facilitate higher quality achievement (at

least 65% of coverage) – 0.3 points each

e.g.

i. Engineered wood/ Stone flooring ii. Vinyl flooring iii. Other productive material

Max. 1.0

0

Certified Personnel Deployed Bonus Point

Certified CONQUAS Supervisor x1 0.15 x 2

Certified CONQUAS Manager x1 0.60

Total 0.9

Step 3: Computation of Final CONQUAS Score

Area of Works/Component Project Score

Main assessment score 83.1

Bonus 2.4

CONQUAS Score 85.5

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CONQUAS® 2019


Scenario 2:

Project Type ‐ Private Residential

Roofing System ‐ Flat Roof

Structural System ‐ PPVC system (70% coverage) accredited under

the PPVC MAS and supplied by a SCI Accredited

Precaster

Toilets ‐ 70% Prefabricated Bathrooms accredited under

the PPVC MAS and supplied by an Accredited

Precaster (including bathrooms within PPVC

modules)

QM rating ‐ QM Merit

Fulltime Certified Personnel ‐ 1 CONQUAS supervisor, 1 QM supervisor, 1 QM

Manager

Step 1: Main Assessment Score

Assessment Items Weightage

(%) Score Remarks

Internal Finishes 60 56.6

Floor 16.3 15.8

Internal Wall 10.2 9.7

Ceiling 10.1 9.5

Door 7.2 6.5

Window 7.2 6.6

Component 6 6.3

M&E basic Fittings 3 2.2

Installation Methods

Verification and Functional Tests 20 20

Field Window Water‐Tightness

Test (WTT) (BCA Test)

9 9

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CONQUAS® 2019


*Field Window Water‐Tightness

Test (WTT) (Self‐Testing) *Pre‐requisite submitted

Wet Area Water‐Tightness Test

(BCA Test) 5 5

*Wet Area Water‐Tightness Test

(Self‐Testing) *Pre‐requisite submitted

Pull‐Off‐Test for Internal Wall

Tiles 4 4

Installation Method Verification 2 2 .

External Finishes 20 15.5

Roof 5 3

External Wall 5 4.5

External Works 10 8

Sub Total

CONQUAS Score 100 92.1

Step 2: Computation of Bonus Points

Requirement Bonus Point Score

Use of advance precast concrete system (APCS)

elements supplied by SCI Accredited Precasters

0.5

0

Use of prefabricated MEP plant modules 0.5 0

Use of Prefabricated Bathroom Unit (at least 65% of

toilets)

1.0

1.0

Use of Prefabricated Prefinished Volumetric

Construction (PPVC) (at least 65% of coverage)

{The PPVC system has to be accredited under the

PPVC Manufacturer Accreditation Scheme (MAS)}

2.0

2.0

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Use of Mass Engineered Timber (e.g. Cross

Laminated Timber, Glued Laminated Timber, etc.) (at

least 65% of coverage)

{A building is deemed to be constructed using

engineered timber if both the floor (including roof)

and wall are constructed using engineered timber.}

1.0

0

Use of productive materials, which facilitate higher

quality achievement (at least 65% of coverage) – 0.3

points each

e.g.

i. Engineered wood/ Stone flooring

ii. Vinyl flooring

iii. Other productive material

Max. 1.0

0

Certified Personnel Deployed Bonus Point

Certified CONQUAS Supervisor x1 0.15

Certified QM Supervisor x1 0.30 Certified QM Manager x1 0.60

Total 1.05


QM STAR ‐

QM EXCELLENT ‐

QM MERIT 0

Step 3: Computation of Final CONQUAS Score

Area of Works/Component Project Score

Main assessment score 92.1

Bonus 4.0

CONQUAS Score 96.1

Note: Project will be published as CONQUAS

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3.7 Publication of CONQUAS Scores

The overall CONQUAS scores of projects are published and accessible for viewing on the IQUAS (Information on Construction Quality) Portal at BCA’s website. Projects

scoring 95 CONQUAS points or higher will only be shown as “CONQUAS ”. Higher CONQUAS scores generally reflect better workmanship. However, scores beyond 95 points are often achieved at significant cost and effort disproportionate to the

incremental achievement in quality. The “CONQUAS ” rating facilitates setting realistic quality benchmarks balanced with productivity and cost considerations.

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CONQUAS® 2019

We shape a safe, high quality, sustainable and friendly built environment

Appendix 1

QUALITY STANDARDS FOR INTERNAL FINISHES WORKS

Architectural Finishes

Item* Standards 1 Floors 1a General Requirements 1) Finishing No stain marks Consistent colour tone Floor divider provided where required 2) Alignments & Evenness Evenness of surface (not more than 3mm per 1.2m) Falls in wet areas should be in right direction No ponding in falls for wet area For staircases, the variance in lengths of threads and risers

must not exceed 5 mm; nosing must be straight Skirting size and joint aligned with floor if of same material 3) Crack & Damages No visible damage / defects 4) Hollowness / Delamination No hollow sound when tapped with a hard object No sign of delamination 5) Jointing Consistent skirting thickness No visible gap between wall & skirting 1b Screed finish 1) Surfaces should not be unduly rough or patchy 2) No visible trowel marks 3) Expansion joints should be provided at interval as stated by

architect 1c Tiled finish 1) Consistent colour and neat pointing 2) No hollow sound when tapped with a hard object 3) Joints are aligned and consistent with skirting and wall tiles 4) Consistent joint size 5) Lippage between 2 tiles should not be more than 0.5 mm 6) Expansion joints should be provided at interval as stated by

architect

* An item is deemed to have failed if any one of the standards is not met

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Item* Standards 1d Timber floor 1) No warpage 2) Timber strips to rest firmly on joists or screed 3) No visible gaps in between timber strips 4) Edges of the floor to be properly sealed 1e Carpet 1) Stretched and even surface 2) Joint should not be visible 3) Proper anchoring at all edges 1f Raised Floor 1) No loose floor panels 2) No protrusion / potential of tripping over floor panels 3) No jolting or rocking panel 1g Mass Engineered Timber

(MET) 1) Surface finish grade as per project’s specifications

2) Visual finish surface to be planed and sanded 3) Knot size tolerance:

a. Domestic grade ‐ Not more than 20 mm diameter b. Industrial and Standard grade ‐ Not more than 50 mm

diameter

4) Voids to be filled if specified 5) No damages e.g. dents 6) Crack tolerance:

a. Domestic grade ‐ Not more than 200 mm long and 2 mm width

b. Industrial and Standard grade ‐ Not more than 400 mm long and 4 mm width

7) Hollowness:

a) Not applicable for exposed MET elements b) Not applicable for ceramic/stone/screed floor finishes laid

directly on MET elements c) No hollowness for ceramic/stone floor finishes laid on

screed over MET elements


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Item* Standards 2 Internal Walls 2a General 1) Finishing No stain marks Consistent colour tone No rough / patchy surface 2) Alignments & Evenness Evenness of surface (not more than 3mm per 1.2m) Verticality of wall (not more than 3mm per m) Walls meet at right angles (not more than 4mm over

300mm) Edges (wall to wall) to appear straight and aligned 3) Crack & Damages No visible damage / defects 4) Hollowness / Delamination No hollow sound when tapped with a hard object No sign of delamination 5) Jointing Straightness of corners and joints 2b Plaster Finish 1) Surface evenness (not more than 3mm over 1.2m) 2) No hollow sound when tapped with a hard object. 3) Surfaces should not be unduly rough or patchy esp no

brush / trowel marks 2c Tiled Finish 1) Tile joints aligned and with consistent joint size 2) No hollow sound when tapped with a hard object 3) Consistent colour and neat pointing 4) Lippage between 2 tiles should not be more than 0.5mm 2d Cladding 1) Proper anchorage for panels 2) Joints aligned and with consistent joint size 3) Sealant material compatible with cladding 4) Consistent spacing and within allowable tolerance 2e Architectural Coating 1) Substrate ‐ see plaster finish 2) Finished texture and colour to be uniform


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Item* Standards

2f Painting 1) Substrate ‐ see plaster finish 2) Surfaces are evenly painted 3) Good opacity, no patchiness resulted from touch up works

4) Free from peeling, blister and chalkiness 5) No discolouration and fading 2g Pre‐cast concrete planks 1) Alignment with adjacent planks not more than 3mm 2) Plane tolerance (3mm / 1.2m) 2h Wall Paper 1) Stretched and even surface 2) Joint should not be visible 3) Proper anchoring at all edges 4) Edges should be neatly laid and finished 2i Glass Blocks 1) Pointing should be satisfactory 2) Joint should be even

3) Glass blocks should be properly aligned 2j Wood / Timber Panels 1) Timber panels to rest firmly on joist or screed 2) No visible gaps between panels 3) Edges should be properly aligned and sealed 4)

5)

No warpage No cracks

2k Fair‐Face Concrete 1) Consistent distribution of blowholes for the same sample/

surrounding area 2) All blowhole sizes to be equal or less than 8mm

3) Consistent tonality for the same sample/ surrounding area 4) No exposed aggregate 5) No cracks and damages


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Item* Standards

2l MET 1) Surface finish grade as per project’s specifications 2) Visual finish surface to be planed and sanded 3) Knot size tolerance:

a) Domestic grade ‐ Not more than 20 mm diameter b) Industrial and Standard grade ‐ Not more than 50 mm

diameter


a) Domestic grade ‐ Not more than 200 mm long and 2 mm width

b) Industrial and Standard grade ‐ Not more than 400 mm long and 4 mm width

7) Hollowness not applicable for exposed MET elements


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Item* Standards

3 Ceilings 3a General Requirements 1) Finishing No stain marks Consistent colour tone No patchy surface 2) Alignment & Evenness Overall surface should be smooth, even, not wavy Straightness of corners 3) Crack & Damages No visible damage e.g spalling, leaks, cracks, etc 4) Roughness No rough surface 5) Jointing Consistent, aligned and neat 3b Skim Coats / Boarded

Ceiling 1) Not patchy, with no pin holes and with no trowel marks

2) Formwork joints are grounded smooth 3) Paintwork with good opacity and with no brush marks 4) Access door joints should be sharp and in consistent width 3c False ceiling / Grid System 1) Alignment of rails should be visually straight 2) Surface should be overall level and even 3) Chipped surfaces or corners should not be seen 3d MET 1) Surface finish grade as per project’s specifications 2) Visual finish surface to be planed and sanded 3) Knot size tolerance:

a) Domestic grade ‐ Not more than 20 mm diameter b) Industrial and Standard grade ‐ Not more than 50 mm

diameter




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CONQUAS® 2019


Item* Standards

4 Doors 4a General Requirements 1) Joints & Gap No visible gaps between door frame and wall Consistent & neat joints Consistent gap between door leaf and frame and not more

than 5mm No visible gaps within door leaf and door frame Consistent and no visible gaps for mitre joints 2) Alignment & Evenness Alignment/level with walls Door frame and leaf to flush Door and frame corners maintained at right angles No rattling sound when door is closed 3) Material & Damages No stain marks and any visible damage No sags, warps on door leaf Fire stop provided where necessary Door joints and nail holes filled up, properly sanded down

and with good paint finish (including on top and bottom of door leaf and consistent in colour)

Glazing clean and evenly sealed with gasket No sign of corrosion for metal frame Consistent colour tone 4) Functionality Ease in opening, closing and locking No squeaky sound during swinging the leaf 5) Accessories Defects Lock sets with good fit and no stains No sign of corrosion in ironmongery No missing or defective accessories Note 1: Civil defence shelter door will be considered as part of wall finishes Note 2: Metal gate will be assessed as component


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Item* Standards 5 Windows 5a General Requirements 1) Joints & Gap No visible gap between window frame and wall Consistent gap between window leaf and frame and not

more than 5mm (timber window only) No visible gaps within window leaf and frame No visible gaps between window leaf and frame Neat joint between window and wall internally and

externally Consistent and no visible gaps at mitre joints 2) Alignment & Evenness Alignment / level with wall openings Window leaf and frame corners maintained at right angles 3) Material & Damages No stain marks and any visible damage / defects Louvre windows with glass panels of correct lengths Glazing clean, evenly sealed with putty or gasket for

aluminium windows 4) Functionality Ease in opening, closing and locking No sign of rainwater leakage No squeaky sound during swinging the leaf 5) Accessories Defects Lock sets with good fit and aligned No sign of corrosion No missing or defective accessories Countersunk screws levelled and flushed. No over‐tightened

screws Stainless steel screws at hinges for swing window


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CONQUAS® 2019


Item* Standards 6 Components 1) Internal fixtures such as wardrobe, kitchen cabinet, vanity top,

mirror, bathtub, water closet, shower screen and basin 2) External fixtures such signage, emergency lightings, railings,

unit number plates, lift fittings, letter box, lightings, metal gate etc

6a General Requirements 1) Joints & Gap Consistent joint width & neat joint No visible gap Welding joints grounded or flushed 2) Alignment & Evenness Level and in alignment 3) Material & Damages No stain marks No visible damage / defects Consistent in colour tone 4) Functionality Functional, secured and safe 5) Accessories Defects No missing accessories No sign of corrosion No visible damages / defects


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Basic M&E Fittings

Item* Standards 1 General Requirements 1) Joints & Gap No visible gap Consistent joint width & neat 2) Alignment & Evenness Aligned, leveled and straight 3) Material & Damages No visible damage / defects No stain marks Securely fixed Consistent colour tone 4) Functionality Functional and safe 5) Accessories Defects No missing accessories No visible damage / defects

2 Plumbing & Sanitary Fittings 2a Gully & Floor Trap 1) No damage or chokage 2) Must be securely fixed 3) Trap's top lower than the surrounding floor level 2b Pipes 1) Visually aligned horizontally, vertically and parallel to building

surface 2) Inclined pipes laid to proper gradients 3) No leakage at joints 4) Plumb < 10mm / storey height 5) Brackets firmly secured & adequately spaced 6) If painted, no drippings & with good opacity 2c Fittings 1) Firmly secured & joints properly sealed & pointed 2) No leakage at joints


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CONQUAS® 2019


Item* Standards 3) No chipping or cracks 4) No paint drops or mortar droppings 5) Fittings in working condition 6) Accessible for maintenance 7) Do not cause obstruction / pose as safety hazard (e.g. sprinkler

head to point inward). 8) No sediments / particles found in water collected at terminal

water fittings (remove aerator & showerhead). 9) All sensor covers properly sealed against water seepage 10) Materials used are of approved types

3 M&E Fittings e.g. power point, telephone point, air‐con diffuser, fan coil unit,

lighting, smoke alarm, sprinkler heads, CCTV camera, etc. 3a Installation 1) Fittings must be aligned and location as per approved drawings. 2) No stains 3) Neat patch‐up for pointing / penetration 3b Safety 1) No exposed wiring within reach 3c Damages 1) No visible damage


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Appendix 2

QUALITY STANDARDS FOR EXTERNAL FINISHES WORKS

Roof

Item* Standards

1 Construction 1a General Requirements 1) Stain / Painting No stain marks Good paint works 2) Rough / Uneven / Falls Look smooth and with no tool marks Even and level esp no potential in tripping Good falls in right direction 3) Crack / Chip / Damage No visible damages / defects 4) Joint / Sealant / Alignment Consistent joint width, neat & aligned 5) Chokage / Ponding No sign of chokage and ponding 6) Construction No sign of leaking Proper dressing for any protrusion Neat & secured installation of fixtures 1b Flat Roof 1) Ponding less than 3mm 2) Surface to level to avoid tripping 3) Proper dressing for any protrusion 4) Openings to be sealed to prevent pest invasion 5) Clean and no stain marks 1c Pitched Roof 1) No leaking 2) No rust or stains 3) Good painting to roof structural members 4) Roof tiles in alignment 5)

6) 7)

Openings to be sealed to prevent pest invasion Consistent colour tone Proper dressing for any protrusion

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Item* Standards

1d Waterproofing (exposed) 1) Should be evenly installed, no sharp protrusion 2) Complete adhesion to base 3) Good laps at joints and proper vertical abutment details 4) No leaking and sign of damage to membrane/coating 5) Clean and no mortar stains 6) No paint defects 1e Gutters 1) No ponding and chokage 2) No cracks, chips and any other visible damages / defects 3) RWDP inlet should be lower than the surrounding gutter

invert level 4) Gutter and RWDP inlet to be covered to prevent chokage

where practical 5) Clean and no cement stains


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External Wall

Item*

Standards

1 General Requirements 1) Evenness / Roughness Overall surface should be even, not wavey & not patchy 2) Staining / Painting No visible stain marks Good paint works 3) Cracking / Damages No visible damage / defects 4) Jointing / Alignment External features visually in alignment Corners of wall maintained at right angles and straight Consistent joint width, neat & aligned 2 Plaster Finish 1) As above 3 Tiled Finish 1) Tile joints aligned and between 2‐4mm wide unless specified 2) Plumb tolerance and evenness of surface (3mm / 1.2m) 4 Claddings / Curtain Walls 1) Gaps around openings to be properly sealed 2) Joints of regular widths as specified 3) Plumb tolerance as specified 4) Evenness of surface, no dents or scratches 5) Sealant material compatible with cladding 5 Facing Brickwork 1) 10mm joint with pointing 2) Weepholes are provided as specified 3) No mortar droppings and other stains 4) No efflorescence


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CONQUAS® 2019


Item*

Standards

6 Architectural Coating 1) Substrate ‐ see plaster finish 2) Finished texture and colour to be uniform 3) No paint drips and other stains 7 Painting 1) Substrate ‐ see plaster finish 2) Surfaces are evenly painted; no patchiness due to touch up work 3) Good opacity, no discolouring and free from peeling 8 Fair‐Faced Concrete 1) No exposed aggregate 2) Consistent tonality when viewed as a whole 9 MET 1) Crack tolerance:




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External Works

Item*

Standards

1 General Requirements 1) No stain marks and visible damages / defects (basis for assessment) 2) Finishes must be even, level , align & consistent 3) Consistent joints width and neat 4) Paintworks with good opacity, no patchiness and brush

marks 5) Constructed according to Contract Specifications 6) Fixtures installed must be safe, secured and functional 7) Standards defined under Part 1: Internal Finishes, Part 2:

Roof and Part 3: External Wall shall apply for similar items 8) MET (Mass Engineered Timber) standards applied for MET

finishes as in Part 1 Internal Finishes 1a Link‐Way / Shelter 1) Floor as per Internal Finishes ‐ Floor 2) Column as per Internal Finishes ‐ Wall 3) Ceiling as per Internal Finishes – Ceiling 4) Other Finishes as per Internal Finishes – Components 5) M&E Fitting as per M&E Works – Part 5 Basic M&E

Fittings 1b Apron & Drain 1) Drain Free flowing and no ponding of water 2) Drain Cover level and do not jolt or rock Gaps between drain covers and side of drain between 5‐

10mm wide Drain grating properly painted 3) Apron 1 Bitumen joints with neat edges and sufficient length No ponding 4) Apron 2 – as per Apron 1 5) Inspection Chamber Inspection chambers are level with surrounding without

depression and with tolerance of Covers to be level with frames

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CONQUAS® 2019


Item*

Standards

1c Roadwork & Carpark 1) Side Drain as per 1b Apron & Drain 2) Road Surface No ponding Road painting according to drawings; dimensional tolerance

of 5mm Gaps between aeration slabs properly filled up with sand Aeration slabs stable and not broken 3) Kerbs – as per General Requirements 4) Road Sign Provided according to specifications Firm and secured at base – with footing if required Metal parts below ground are corrosion treated 5) Lightings – as per 1c Road Sign 1d Footpaths & Turfing 1) Footpath as per Internal Finishes ‐ Floor 2) Turfing No depression or bald patches Turfing done evenly, no dead grass or weeds 3) Lightings as per 1c Road Sign 4) Fencing & Railing As per 1c Road Sign Wire fencing is PVC covered Footings provided for supports Vertical tolerance (4mm / 1.2m) 5) Other Fixtures as per Internal Finishes ‐ Components 1e Playground 1) Floor as per Internal Finishes ‐ Floor 2) Permanent Fixture1 as per Internal Finishes ‐ Components 3) Permanent Fixture2 as per Internal Finishes ‐ Components 4) Lightings as per 1c Road Sign 5) Signage as per Internal Finishes ‐ Components

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Item*

Standards

1f Court 1) Floor 1 as per Internal Finishes ‐ Floor 2) Floor 2 as per Internal Finishes ‐ Floor 3) Signage as per Internal Finishes ‐ Components 4) M&E Fitting as per M&E Works – Part 5 Basic M&E Fittings 5) Permanent Fixture as per Internal Finishes ‐ Components 1g Fences & Gates 1) Fence Left as per 1d – item 4) 2) Gate as per Internal Finishes ‐ Components 3) Fence Right as per 1d – item 4) 4) M&E Fitting as per M&E Works – Part 5 Basic M&E

Fittings 5) Signage as per Internal Finishes ‐ Components 1h Swimming Pool 1) Side Drain as per Internal Finishes ‐ Floor 2) Foot Path 1 as per Internal Finishes ‐ Floor 3) Floor Path 2 as per Internal Finishes ‐ Floor 4) M&E Fitting as per M&E Works – Part 5 Basic M&E

Fittings 5) Other Fixture as per Internal Finishes ‐ Components 1i Club House 1) External Wall 1 as Part 3 External Wall 2) External Wall 2 as Part 3 External Wall 3) External Wall 3 as Part 3 External Wall 4) External Wall 4 as Part 3 External Wall 5) Apron & Drain as per 1b

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Item*

Standards

1j Guard House 1) External Wall 1 as Part 3 External Wall 2) External Wall 2 as Part 3 External Wall 3) Apron & Drain as per 1b 4) Gantry as per Internal Finishes ‐ Components 5) Other Fixture as per Internal Finishes ‐ Components 1k Electrical Substation 1) External Wall 1 as Part 3 External Wall 2) External Wall 2 as Part 3 External Wall 3) External Wall 3 as Part 3 External Wall 4) External Wall 4 as Part 3 External Wall 5) Apron & Drain as per 1b


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Appendix 3

QUALITY STANDARDS FOR MATERIAL & FUNCTIONAL TESTS

Material & Functional Tests

Item* Standards 1 Field Window Water‐

tightness Test 1) No sign of leakage using BCA's Window Water‐tightness

Test method. Leakage is defined as “any appearance of uncontrolled water, other than condensation, on the indoor face of any part of the wall & window”.

2) BCA's Water‐tightness Test parameters:

Water intensity: 300mm/hr : 1 litre/min/m of joint Wind Pressure: 240 Pa Nozzle inclination: 90o to window 1 sample = 2m length of joint Spray duration: 10 minutes

2 Wet Area Water‐tightness

test (i.e. Bathrooms, toilets & flat roof)

1) No sign of leakage after ponding wet areas over a minimum period of 24 hrs.

2) Ponding with final finish in‐place 3 Internal wet area

waterproofing process 1) According to approved method statement, shop drawings and

related BCA’s Good Industry Practices guides 4 Tiling installation process 1) According to approved method statement, shop drawings and

related BCA’s Good Industry Practices guides 5 Timber flooring installation

process 1) According to approved method statement, shop drawings and

related BCA’s Good Industry Practices guides 6 Windows installation

waterproofing process 1) According to approved method statement, shop drawings and

related BCA’s Good Industry Practices guides 7 Pull‐off test (POT)for

internal wall tiles 1) Minimum tensile strength of 0.15 N / mm2

* An item is deemed to have failed if any one of the standards is not met.

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For the assessment of the field window water‐tightness test, the number of points shall be

awarded based on the percentage of non‐compliance as tabulated in the table below :

Points Awarded for BCA Field Test (100%)

Percentage of non‐compliance

N 0%

(15‐x)* N/15 0% < x < 15%

0 ≥ 15%

Note: No points shall be given if test is not carried out.

“N” is the maximum points for WTT test under the respective building categories

“x” is the percentage of samples failed.

For the assessment of the wet area water‐tightness test, the number of points shall be awarded

based on the percentage of non‐compliance as tabulated in the table below :

Points Awarded for BCA Field Test (100%)

Percentage of non‐compliance

N 0%

(2‐x)* N/2 0% < x < 2%

0 ≥ 2%

Note: No points shall be given if test is not carried out.

“N” is the maximum points for wet area water tightness test under the respective building

categories

“x” is the percentage of samples failed.

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Appendix 4

Defects Grouping Guide for Assessment of Internal Finishes

Element Defects Grouping Defects Description

Floor Finishing Stains, Painting / Coating Defects, Tonality, Patchy & Roughness

Wall Alignment & Evenness Alignment, Unevenness, Squareness

Crack & Damages Crack, Chip, Dent, Scratches

Hollowness / Delamination

Jointing Joints, Pointing

Ceiling Finishing Stains, Painting / Coating Defects, Patchy

Alignment & Evenness

Crack & Damages Crack, Chip, Dent, Scratches

Roughness

Jointing Joints, Pointing

Door Joints & Gap Joints, Gap etc. too big, Inconsistent, Improper Seal

Window Alignment & Evenness

Component Material & Damages Crack, Chip, Dent, Scratches, Defects, Finishing, Tonality

M&E Fittings Functionality Movement, Functionality, cannot be opened or closed properly, Loose

Accessories Defects Missing items, Improper Fixing, Stains, Corrosion, Other damages

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Appendix 5

BUILDING GROUPING GUIDE

Private Residential Public

Residential Non Residential

In General : All types of residential residential building built by private developers

HDB Public Residential building

In General : All types of building constructed mainly for non‐residential use

e.g. e.g.

Condominium Bank

Apartments Office Building

Bungalow Shopping Complex

Semi‐Detached Hotel

Terrace House Supermarket

Cluster Residential Airport

Mixed Development Hospital

with residential component more than 50% by GFA

University

Regional Library

Conference Hall

Arts and Cultural Centre

Mixed Development

with more than 50% non‐residential area by GFA

Note: The above is only meant to be a general guide in determining the Category of project.

The actual grouping might vary depending on the project details in the application. For

instance, a private mixed development building project, i.e., one with commercial and

residential components in the development, is categorized as Private Residential.

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CONQUAS 2019 Revision Log

Rev Description Released Date

*Date Effective

RD Draft for feedback 08 Oct 2019 Not applicable

R0 Launch for Implementation 20 Dec 2019 20 Dec 2019

R1 Amendment to Para 2.1b(ii)

For projects that adopt PPVC, a maximum of 30% of the total window water-tightness test samples and 20% of the total wet area water tightness test samples will be carried out in the factory.

Amendment to footnote 3 of Table A

The initial CONQUAS score will be derived after 20% (for tier 2a) and 50% (for tier 2b) of the required architectural internal finishes samples are completed.

27 Dec 2019 20 Dec 2019

R2 3.3. Bonus points page 21

(b) Certified QM/CONQUAS personal

Added new note 3

The QM/CONQUAS manager/supervisor shall demonstrate commitment and satisfactory performance during the project duration pertaining to quality and CONQUAS assessment issues. It is the responsibility of the certified personnel to ensure the project personnel attend all allocated CONQUAS training, assessments are completed, and submission of documents done timely. They should conduct themselves in a professional manner when dealing with feedback on defects related to workmanship quality, failing which, CONQUAS bonus points will not be awarded.

9 April 2020 1 April 2020

R3 1.2. Scope of CONQUAS Inserted note that

30 April 2020

30 April 2020

R4 – 1 Oct 2021

55

CONQUAS® 2019


Private residential developments include private mixed developments with residential component Replaced all mention of “housing” with “residential”

R4 3.3 Bonus points page 20

(a) Design/Material Choices Updated PPVC requirement

Use of Prefabricated Prefinished Volumetric Construction (at least 65% of coverage)

Updated MEP requirement

Use of prefabricated MEP plant modules

1 Oct 2021 1 Oct 2021

* Applicable to projects with tender called on and after this date.

BCA Construction Quality Assessment System

Documents

Transcript of BCA Construction Quality Assessment System